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Elastic moduli of precompressed pyrophyllite used in ultrahigh pressure researchThe propagation of ultrasonic pulses in pyrophyllite specimens was studied to determine the effect of specimen precompression on the measured elastic moduli. Measurements were made at room pressure and, for the precompressed specimens, to pressures of 3 kbar. Pyrophyllite was found to be elastically anisotropic, apparently the result of the fabric present in our material. The room pressure adiabatic bulk modulus as measured on specimens made of isostatically compacted powered pyrophyllite was determined to be 96.1 kbar. The wave speeds of ultrasonic pulses in pyrophyllite were found to decrease with increasing specimen precompression. A limiting value of precompression was found, above which no further decrease in wave speed was observed. For the shear wave speeds this occurs at 10 kbar while for the longitudinal wave at 25 kbar. In the limit, the shear waves propagate 20% slower than in the unprecompressed samples; for the longitudinal wave the difference is 30%.
Document ID
19750012694
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Sachse, W. (Cornell Univ. Ithaca, NY, United States)
Ruoff, A. L. (Cornell Univ. Ithaca, NY, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1974
Subject Category
Structural Mechanics
Report/Patent Number
NASA-CR-142598
REPT-2366
Accession Number
75N20766
Funding Number(s)
CONTRACT_GRANT: NGR-33-010-189
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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